If you find that Cesar is a guy that you can trust blindly in all this, then that will be your conclusion.
But I don´t really know if he is.
I came across this article about a Discovery Times Channel broadcast, where they apparently have more on the witness Don Schulman. Would like to see this broadcast.
"On June 6, 2007 the Discovery Times Channel broadcast a one-hour special on the murder of Senator Robert Kennedy in Los Angeles at the Ambassador Hotel on June 4, 1968. (...)
A previously taped interview followed as the show tried to focus on a chief suspect in the killing, Thane Eugene Cesar. Don Shulman, a runner for a press organization, said that he saw the security guard behind Kennedy pull his gun and fire three shots during the fusillade. In an interview done for the show, Charach said that Cesar changed his story on this point, but he has him admitting to pulling his gun on tape. Joling chimed in here by saying that no other gun was tested by the LAPD and that Cesar was allowed to leave the pantry for ten minutes before returning to collect his tie, which had fallen on the floor. The implicit point here being that although Cesar says he was carrying a .38 that night, he also owned a .22, an issue which he also lied about. And it is this smaller caliber weapon which LAPD says was used in the crime."
http://www.ctka.net/consp_test.html